Lifting-jack.



H. A. SGHATZ.

LIFTING JAGK. APPLICATION FILED JAN; 17, 1908.

1,005,479, Patented Oct. 10,1911.

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I LIFTING JACK;

APPLICATION FILED JAN. 17, 1908.

1,005,479. 1 Patented 001. 10,1911.

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H. A. SGHATZ.

LIFTING JACK. V

APPLIGATION FILED JAN.17, 1908.

1,005,479. Patented Oct. 10,1911.

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* UNITED. STATES PATENT onmon.

HERRMAN A. SCHA'IZ, OF CHAPPAQUA, NEW YORK, ASSIGNOR TO ACME BALL BEARING COMPANY, OF CHAPPAQUA, NEW YORK, A CORPORATION OF NEW YORK.

LIF'IING-JACK.

Specification of Letters Patent.

Patented Oct. 10, 1911.

Application filed January 1'7, 1908. Serial No. 411,315.

To all whom it may concern:

Be it known that I, HERRMAN A. SOHATZ, of the town of New Castle, village of Chappaqua, county of Westchester, and State of New York, have invented new and useful Improvements in Lifting-Jacks, of which the following is a full, clear, and exact description, when taken in connection with the accompanying drawings, which form a part thereof.

This invention relates to lifting jacks, and more particularly to that class of jacks having a vertically arranged lifting screw intermeshing with screw threading on a standard or support, whereby the screw and the superimposed lifting device is raised or lowered vertically. In the present form a worm with its operating crank is supported by the movable lifting cylinder.

The invention has for its object the product-ion of novel means for supporting the worm and worm gear, both of which are shown removable, and of a novel form of friction device in this type of jacks to retard the downward movement of the screw in the standard.

To these and other ends, the invention con sists of the several improvements and combinations of parts set forth and claimed hereinafter.

Referring to the drawings for a more particular description, Figure 1 represents an elevation of a jack embodying the invention, partly shown in vertical section through the friction device, Fig. 2, a vertical central section through the jack, Fig. 3, a horizontal section through the worm gear and associated parts, Fig. 4c, an end View of the removable worm hanger, in detail, Figs. 5 and 6, top and inside views of the same, and Fig. 7, a vertical section through the checking device.

In all figures, similar letters of reference represent like parts.

The parts designated b the letter A represent the standard or support of the jack, which as shown consists of an upright hollow cylinder the upper end of which is provided with an axial perforation internally screw threaded for the reception of the lifting screw B depending from an integrally formed worm gear C. Above the worm gear C is integrally formed a head D, provided with an annular flange E, having a recess F for ball bearings G. The ball bearings Gr are adapted to carry a hollow lifting cylinder'H, the sides of which surround or incase the lifting screw and the upper end of the standard A. By this construction, the rotation of the screw B tends to raise it or lower it in the standard A, and as the screw is raised or lowered it carries with it the lifting cylinder H. The rotation of the lifting screw B is effected by a worm I on a shaft K, which is provided at one end with the usual crank arm L. The shaft K is carried in a hanger M, shown in detail in Figs. 4, 5 and 6. The ends of the hanger, N, are adapted to fit into substantially semi-circular recesses in the lifting cylinder H, and the side 0 of the hanger closes the opening in the side of the cylinder. Screws P, or other suitable means, are employed to secure the hanger on the lifting cylinder H, and when the hanger is properly assembled the worm I will mesh with the worm gear C, so as to rotate the latter upon the rotation of the shaft K. At one side of the worm hanger is a friction box B through which projects the shaft K, and at this point the shaft is provided with a ratchet wheel or gear S. Surrounding this ratchet is a ring T, provided with oppositely disposed recesses U in which are located pawls V pivoted to the ring T and held in engagement with the ratchet S by means of springs W. On either side of the ring T are friction plates X of fiber, or other suitable material. These friction plates X bear against the inside of the box and against a cap Y adapted to be screwed into the open side of the box and close the same. By means of the cap Y the adjustment of the friction is made. By this construction when the shaft K is turned in the direction to raise the lifting screw and cylinder the ratchet gear S will rotate without engaging the pawls V, but if pressure is exerted on the lifting cylinder and screw to force them downward and turn the shaft in the reverse direction the pawls will engage the ratchet gear S and the ring T and friction plates X will be moved therewith so that the friction is greatly increased upon the rotation of the shaft K in this direction.

The hanger M is provided with a hook Z which projects into the interior of the cylinder H when the hanger is in place and extends under that portion of the worm gear 0 which is meshing with the worm. The worm and gear are thus placed in position to mesh with each other and the portion of the gear so intermeshing is continually supported by the hook of the hanger.

Near the base of the lifting cylinder is provided a dog A pivoted to the tWo lugs 13 on the lifting cylinder, and having its engaging nose C project through a perforation I) in the lifting cylinder H. A spring E constantly tends to force this nose inward, and when the cylinder is raised the nose C will take into an annular groove F near the top of the standard A toprevent the accidental removal of the lifting cylinder from the standard. If it is desired to remove the lifting cylinder it is merely necessary to turn the dog A on its pivot, so that the nose C will be withdrawn from engagement with the groove F.

Handles G are pivoted to the lifting cylinder so that the entire jack may be carried about as desired.

Having now described my invention, what I claim and desire to secure by Letters Patent, is z 1. In a lifting ack, the combination with a standard; of a vertically disposed lifting screw; a worm .wheel rigidly secured thereto; a lifting cylinder operated by said screw; a horizontally disposed worm carried by said lifting cylinder; a removable hanger; and a support carried by said removable hanger for the portion of said worm wheel intermeshing with said Worm, substantially as described.

2. In a lifting ack, the combination with a standard; of a vertically disposed lifting screw; a worm wheel rigidly secured thereto; a lifting cylinder operated by said screw; a horizontally disposed worm carried by said lifting cylinder; and a separate removable support carried by said lifting cylinder for the portion of said worm wheel intermeshing with said worm, substantially as described.

3. In a lifting jack, the combination with a standard; of a vertically disposed lifting screw adapted to be raised or lowered therein; a worm wheel rigidly secured thereto; a removable hanger adapted to be mounted on said lifting cylinder; a horizontally disposed .worm carried by said hanger; a crank shaft operating said Worm; and a friction device carried by said hanger adapted to engage said shaft when the shaft is rotated in one direction, substantially as described.

In witness whereof, I have hereunto set my hand on the lth day of J an., 1908.

HERRMAN A. SGHATZ.

Witnesses:

Trros. H. WARNER, CHAs. S. BOUTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

